// ------------------------------------------------------------------------------
// 
// Copyright (c) 2006-2008 Swampware, Inc.
// 
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
// 
// ------------------------------------------------------------------------------
using System;

namespace Water.Commands
{
	/// <summary>
	/// Summary description for IncludeCommand.
	/// </summary>
	public class IncludeCommand : Water.Commands.Command
	{

		public IncludeCommand()
		{
		}

		public override string Name
		{
			get { return "include"; }
		}

		public override object Evaluate(Water.List expressions, Water.Environment environment, Water.Evaluator evaluator)
		{
			if(expressions.Count != 1)
			{
				throw new Water.Commands.InvalidArgumentsException(this.Name, expressions);
			}

			string filename = (string)evaluator.Evaluate(expressions[0], environment);

			string path = Water.FileReader.ResolvePath(filename, environment);
			Include(path, environment, evaluator);

			return null;
		}

		public static void Include(string path, Water.Environment environment, Water.Evaluator evaluator)
		{
			Water.Dictionary includes = (Water.Dictionary)environment.Identify("_Includes");
			if(includes == null)
			{
				includes = new Water.Dictionary();
				environment.Define("_Includes", includes);
			}
			if(includes[path] == null)
			{
				includes.Add(path, path);



				FileReader reader = null;
				try
				{
					reader = new FileReader(path);

					Water.Interpreter interpreter = new Water.Interpreter(new FileIterator(reader, environment), environment, evaluator);
					interpreter.Start();
				}
				finally
				{
					if (reader != null)
					{
						reader.Close();
					}
				}
			}
		}

	}
}
